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Abstract The female of Haplostomides scotti Chatton and Harant is redescribed, and the male is described for the first time, on the basis of specimens living in the compound ascidian Polyclinum aurantium collected at Roscoff (Brittany, France). Some morphological characters of the female are at variance with the original description, which was based on one specimen from the type locality (Penpoul, near Roscoff). (?) Enterocola beaumonti Scott and Scott may be a synonym of H. scotti. The male of H. scotti is compared with males of species of Botryllophilus with respect to the armature formula for legs 1–4. Similar comparisons are attempted for seven other species of haplostomatins (in the genera Haplostoma, Haplostomides, Haplosaccus) in order to establish morphological differences between males of haplostomatins and botryllophilins.